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Top Forums Shell Programming and Scripting Median and max of duplicate rows Post 302838977 by ritakadm on Wednesday 31st of July 2013 03:29:02 AM
Old 07-31-2013
Median and max of duplicate rows

Hi all,

plz help me with this, I want to to extract the duplicate rows (column 1) in a file which at least repeat 4 times. then I want to summarize them by getting the max , mean, median and min. The file is sorted by column 1, all the repeated rows appear together.

If number of elements is odd, median is middle one , eg 4th element among 7 sorted numbers ... element number (n+1)/2
If number of elements is even, it is the average of middle 2, eg. average of 4th and 5th element for set of 8 sorted numbers...average of n/2 + 1 and n/2

Code:
Inp

R1 1
R1 2
R1 3
R2 1
R2 2
R2 3
R2 100
R3 5


output

R2 100 26.25 2.5 1

I figured our uniq -d option will give me the duplicate lines, but how do I work with at least 4?


Also, I tried to find the mean and median, getting errors but trying to get this to work.


Code:
sort -n file | awk ' { a[i++]=$2;  N[$1]++}
    END { for (key in i) {
                        avg = sum[key] / N[key];}
x=int((i+1)/2); 
if (x < (i+1)/2)
 print (a[x-1]+a[x])/2 " " avg; 
else print a[x-1] " " avg; }'

 

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SORT(1) 						      General Commands Manual							   SORT(1)

NAME
sort - sort a file of ASCII lines SYNOPSIS
sort [-bcdfimnru] [-tc] [-o name] [+pos1] [-pos2] file ... OPTIONS
-b Skip leading blanks when making comparisons -c Check to see if a file is sorted -d Dictionary order: ignore punctuation -f Fold upper case onto lower case -i Ignore nonASCII characters -m Merge presorted files -n Numeric sort order -o Next argument is output file -r Reverse the sort order -t Following character is field separator -u Unique mode (delete duplicate lines) EXAMPLES
sort -nr file # Sort keys numerically, reversed sort +2 -4 file # Sort using fields 2 and 3 as key sort +2 -t: -o out # Field separator is : sort +.3 -.6 # Characters 3 through 5 form the key DESCRIPTION
Sort sorts one or more files. If no files are specified, stdin is sorted. Output is written on standard output, unless -o is specified. The options +pos1 -pos2 use only fields pos1 up to but not including pos2 as the sort key, where a field is a string of characters delim- ited by spaces and tabs, unless a different field delimiter is specified with -t. Both pos1 and pos2 have the form m.n where m tells the number of fields and n tells the number of characters. Either m or n may be omitted. SEE ALSO
comm(1), grep(1), uniq(1). SORT(1)
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